Printing-machine having an oscillating impression-cylinder



C. WINKLER.

PRINTING MACHINE HAVING AN OSCILLATING IMPRESS ION CYLINDER.

APPLICATION FILED FEB. 7, I920.

Patented June 29, 1920.

' HUT/V701? @ar W I by so doing,

UNITED, STATES,

PATENT OFFICE.

CABL WINKLER, OF BERNE, SWITZERLAND.

Specification of Letters Patent. P t te June 29, 92

Application 'fiiearebrua'r 7, 1920. Serial no. 356,936.

To aZZ whom it may concern Be it known that I, CARL WINKLER, a citi- Zen of the Swiss Republic, residing at, Berne, in the Swiss Republic, have invented new and useful Improvements in Printing-Machines Having Oscillating Impression-Cylinders, of which the following is a specification.

My invention relates to a printing machine having an oscillating impression cylinder and a system of tapes for holdingthe sheets during both the printing operation and the subsequent delivery of the sheets to the leading out device. In a machine of this kind the tapes, which are fastened at one end to the cylinder, hold each sheet during the delivery in smooth contact with the cylinder up to the sheet leading off tongues by running over rolls which are in close proximity to said tongues during the delivery of a sheet, but are lifted away from said tongues when a sheet is being taken from the feed table by the grippers on the impression cyl- ,inder.

By reason of this arrangement the back edge of the sheet during the backward-oscillation of the impression cylinder is prevented from leaving said cylinder before the proper time, and, thus, a good delivery of the sheet is assured.

According to my invention 1 also provide a wiper just before the point at which the tapes tangentially meet the impression cylinder. This wiper smooths .out the sheet immediately before it is held by the tapes, and, prevents said sheet from being led over the form in a creased condition. In order to prevent smearing of the freshly printed matter during the backward oscillation of the impression cylinder, the wiper is moved away from the sheet until the backward oscillation is finished.

In the drawing my inventlon is shown by way of example, a brush being shown as wiper.

Figure 1 shows a sectlon through the 1mpression cyllnder and'the organs cooperating therewith just before the printing oper tion begins,

Fig. 2 is a section through the same parts during the delivery of a sheet.

The tapes a, which are alternately wound on and oflZ' the oscillating cylinder are fastened at b to the impression cylinder,while their opposite ends first pass over guide rolls e carried by oscillating levers d and are then wound off and on rolls 0 similar to those used for measure tapes. Said levers (Z are keyed to the oscillating spindle f, and they accordingly alternately take a position inclined toward, and extending away from, the impression cylinder. In thefirst case the tapes form guides for the sheet (being delivered) up to the lay on tongues,

so that said sheet can better pass over the leading out tongues g. In the second case the-tapes are stripped from the impression cylinder through a certain angle, and in th s position they facilitate the feed of a new sheet to the impression cylinder.

The oscillating motion of the levers d can be utilized for moving the brush 2', or a felt cylinder, roller or other equivalent, the operation being so chosen that during the printing operation, thus when the levers d are raised and the tapes are stripped off the impression cylinder for some distance, the wiper bears against the sheet, while during the delivery, that is, when the levers d are inclined toward the impression cylinder, they are turned away from said sheet. The wiper 2' acts on the sheet fed to the impression cylinder at a point which lies just before the point at which the tapes tangen ment, so that the air caught between thej sheet and cylinder and all creases are wiped out before the sheet is grippedby the tapes. In addition to being smoothed out the sheet is also cleanedfrom all dust.

What I claim, and desire to secure by Letters Patent of the United States, is

- 1. A printing machine comprising incombination, an oscillating impression cylinder, a feed table adapted to feed sheets to the summit of said impression cylinder, sheet delivery tongues underneath said feed table, tapes fastened atone end to said impression cylinder and at the other end to rolls and adapted to be wound on and off said rolls and impression cylinder alternately, guide rolls over which said tapes run, and means to alternately move said rolls toward and away from said impression cylinder, substantially as, and for the purpose, set forth. 2. A printing machine comprising in combination, an oscillating impression cylinder,

a feed table adapted to feed sheets to the summit of said impression cylinder, sheet delivery tongues underneath said feed table, tapes'fastened at one end to said impression cylinder and. at the other end to rolls and adapted to be Wound on and off said rolls and said impression cylinder alternately,

guide rolls over which said tapes run, levers carrying said rolls and adapted during the printing movement to assume approximate-V ly a vertical position, and during the delivery of the printed sheet a position inclined toward said impression cylinder, substantially as, and for the purpose, set forth.

3. A printing machine comprising in combination, an oscillating impression cylinder,

a feed tableada'pted to feed sheets to the summit of said' impression cylinder, sheet delivery tongues underneath said feed table, tapes fasten'ed'at one end to said impression cylinder and at the other end to rolls and adapted to-be wound on and off said rolls and-impression cylinder alternately, and a Wiper adapted to-be pressed against asheet' fed to said impression cylinder just before said sheet is caught by said tapes, substantially as, and for the purpose, setforth.

4: A printing machine comprising in comadapted, to be pressed againsta sheet ,fed 7 to said impression cylinder just beforesaid sheet is caught by said tapes, and to be moved away from said impression cylinder pose, set forth. V V

In testimony whereof I have signed my name to this specification in" the presence of two subscribing WVltI18SSGS.

, CQWINKLERP 'Witnesses: I I

R; HEINGARTNER, E. Room.

V during the sheet delivery motion of said cylinder, substantially as, and for thePur 

